Certified Energy Auditor Building Envelope Assessment Questions and Answers

Question 1

An energy auditor performs a blower door test on a small commercial building and measures an airflow rate of 2,500 cubic feet per minute at a pressure of 50 Pascals (CFM50).
If the building's interior volume is 150,000 cubic feet, what is the leakage rate expressed as Air Changes per Hour at 50 Pascals (ACH50)?

Accepted Answer

1.0 ACH50

Answer

0.6 ACH50

Answer

60.0 ACH50

Answer

0.017 ACH50

Question 2

In the context of building envelope components, what is the mathematical relationship between the U-factor and the R-value?

Accepted Answer

They are reciprocals of each other (U = 1/R).

Answer

They are directly proportional (U = R).

Answer

U-factor is the square root of the R-value.

Answer

They are unrelated measures of thermal performance.

Question 3

A client wants to reduce solar heat gain through large, west-facing windows in a commercial building located in a hot climate, without significantly reducing the amount of visible light. Which of the following window properties is most critical to specify for this goal?

Accepted Answer

A low Solar Heat Gain Coefficient (SHGC) and a high Visible Transmittance (VT).

Answer

A high U-factor.

Answer

A high Solar Heat Gain Coefficient (SHGC).

Answer

A low Visible Transmittance (VT).

Question 4

Which of the following is the most significant source of thermal bridging in a steel-framed building with insulation installed between the studs?

Accepted Answer

The steel studs themselves.

Answer

The drywall fasteners.

Answer

The wood blocking used for interior finishes.

Answer

The exterior sheathing.

Question 5

An energy auditor is conducting an infrared (IR) inspection of a wood-framed office building from the exterior on a cold winter night. The IR camera shows a regular pattern of warmer vertical lines on the walls. What is the most likely cause of this thermal signature?

Accepted Answer

Thermal bridging through the wood studs.

Answer

Air leakage through electrical outlets.

Answer

Moisture trapped within the wall cavity.

Answer

Missing insulation in the stud cavities.

Question 6

In a cold climate (heating-dominated), where should the vapor retarder be placed within an exterior wall assembly to be most effective at preventing interstitial condensation?

Accepted Answer

On the interior (warm) side of the insulation, just behind the drywall.

Answer

On the exterior side of the insulation, just behind the cladding.

Answer

In the middle of the insulation layer.

Answer

A vapor retarder is not necessary in cold climates.